[Bug 1679784] Re: Changing from Xorg video driver to NVIDIA driver using Software & Updates does not display debconf prompt

[Adam Conrad]

Hello Amos, or anyone else affected,

Accepted software-properties into xenial-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/software-properties/0.96.20.7 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: software-properties (Ubuntu Xenial)
       Status: Confirmed => Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1679784

Title:
  Changing from Xorg video driver to NVIDIA driver using Software &
  Updates does not display debconf prompt

Status in software-properties package in Ubuntu:
  Fix Released
Status in software-properties source package in Trusty:
  Confirmed
Status in software-properties source package in Xenial:
  Fix Committed
Status in software-properties source package in Yakkety:
  Fix Released

Bug description:
  [SRU Justification]
  software-properties does not display debconf prompts. while most debconf prompts have default answers and this is fine, for installing dkms modules on a SecureBoot-capable system we specifically have a critical debconf prompt with no possible default answer that users need to step through in order for their dkms modules to be usable.

  [Test case]
  1. sudo apt-add-repository ppa:vorlon/debconf-tests
  2. sudo apt update
  3. Launch Settings -> Software & Updates -> Additional Drivers
  4. Confirm that you are offered the option of using the 'noisy-fake-driver' package.
  5. Select this driver and apply changes.
  6. Confirm that no debconf prompt is shown, and the driver package fails to install ('dpkg -l noisy-fake-driver' shows 'iF').
  7. Reset the package state by removing the driver again.
  8. Enable -proposed.
  9. Run update-manager and verify that the new software-properties package is successfully installed from -proposed, pulling in libgtk2-perl in the process.
  10. Close Software & Updates and re-launch it.
  11. Select the 'noisy-fake-driver' package again.
  12. Confirm that you are shown a debconf prompt, and the driver package installs successfully.

  [Regression potential]
  The actual code change is small and self-contained, but the fix also requires pulling in new package dependencies which will also need to be promoted from universe to main in the process.  We need to take extra care to ensure the upgrade path is correct.  This SRU should also be done serially one release at a time to gather feedback at each stage.

  [Original bug description]
  I've encountered this repeatedly.

  In the first installation -- on updating via Software Updater, this
  crashed on upgrading the shim-signed package.

  On suggestions from here:

  I upgrade the system via CLI, i.e. dist-upgrade. This seemed to work,
  however when I now try to swap the display driver, from xorg -->
  nvidia. This now triggered the same issue.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: shim-signed 1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
  Uname: Linux 4.4.0-72-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  Date: Tue Apr  4 18:21:32 2017
  DuplicateSignature:
   package:shim-signed:1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
   Processing triggers for shim-signed (1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ...
   Running in non-interactive mode, doing nothing.
   dpkg: error processing package shim-signed (--configure):
    subprocess installed post-installation script returned error exit status 1
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2017-04-04 (0 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.19
  SourcePackage: shim-signed
  Title: package shim-signed 1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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